JPS63255577A - Rotary comrpessor - Google Patents

Abstract

PURPOSE:To improve the sound suppressing effect by installing a mount for supporting and fixing a sealed case at the positions of the node part and loop part in the natural vibration mode of the lower order at the edge part of the sealed case. CONSTITUTION:The rear part mount 10 of a compressor is fixed through welding at the position of the node part and loop part in the primary natural vibration mode of the rear cover shell 2c of a sealed case 2. Since the rear part amount 10 is fixed through welding at the position of two nodes B and the loop part A between the nodes in the natural vibration mode, the vibration of the rear part mount 10 which is generated by the deformation vibration due to the primary natural vibration mode of the rear cover shell 2c can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in refrigeration equipment and the like.

BACKGROUND OF THE INVENTION In recent years, rotary type compressors have become more mainstream than reciprocating type compressors used in refrigeration equipment and the like from the standpoint of energy and space saving. These rotary compressors usually have an electric compression element directly fixed and housed in a sealed case. Therefore, the vibration generated in the electric compression element 2/ is transmitted to the sealed case without being absorbed by a spring or the like, causing the sealed case to vibrate.
Furthermore, the mount, which was welded to the sealed case, could also vibrate, creating a large amount of noise.

An example of the conventional rotary compressor mentioned above will be described below with reference to the drawings.

FIG. 3 shows an example of a conventional rotary compressor.

In the figure, 1 is a rotary compressor, 2a is a body shell, 2b
is the front lid shell, 2C is the rear lid shell, and is the front lid shell 2.
b and the rear lid shell 2C are welded to the body shell 2a to form a sealed case 2, and there is an electric compression element (not shown) inside.
is directly fixed and stored. Reference numeral 3 denotes a center pin, which is welded and fixed to the sealed case 2 at a position substantially aligned with the axis of the electric compression element.
has been inserted through. 6 is a rear mount, which is fixed to the sealed case 2 by welding. Mount rubber 7 is fixed to the front mount 4 and the rear mount 6 by 3/, -1, and elastically supports and fixes the rotary compressor 1. 8
9 is a discharge pipe, and 9 is a suction pipe.

The operation of the rotary compressor configured as above will be explained below. When the electric compression element inside the sealed case 2 compresses refrigerant, torsional vibrations occur around the axis of the electric compression element due to load fluctuations, etc. occurs, thereby causing the sealed case 2 to vibrate.

Therefore, vibrations are transmitted to the pipes from the discharge pipe 8 and suction pipe 9 fixed to the sealed case 2, causing problems such as noise generation from the pipes and pipe bending. However, since the center bin 3 is located at approximately the same position as the axis of the electric compression element, the front part of the compressor must be supported and fixed at the position where the amount of displacement due to torsional vibration is the smallest. The vibration of the sealed case 2 caused by the torsional vibration of the compressor 1 is suppressed to a small level, and problems such as noise caused by vibrating pipes and pipe bending can be solved. , not only torsional vibrations caused by load fluctuations, etc., but also vibrations that occur when compressing refrigerant.
-゛ There are vibrations caused by refrigerant pressure pulsations, mechanical collisions between parts, sliding, etc. These vibrations vibrate each part and are transmitted to the sealed case 2, vibrate the sealed case 2, and further vibrate the rear mount 6 welded to the rear lid shell 2c of the sealed case 2, thereby generating noise. There is a problem with this.

In view of the above-mentioned problems, the present invention provides a compressor in which the noise reduction effect is improved without impairing the compactness of the compressor and without adding any new parts.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention has the following features:
In a mount that supports and fixes the sealed case by welding to one or both ends of the sealed case, the mount is located at a position that is a node and an abdomen of the lower natural vibration mode of the sealed case end. The present invention has the above-described structure to suppress the vibration of the mount caused by the low-order natural vibration mode of the lid of the sealed case.
This is prevented by fixing the mount at the node of the low-order natural vibration mode at the end of the sealed case, and the mount is fixed not only at the node of the low-order natural vibration mode of the end of the closed case but also at the abdomen. By fixing the mount, the vibration of the end of the sealed case can be prevented by increasing the rigidity of the abdomen in the natural vibration mode, and the increase in noise due to the vibration of the end of the sealed case and the mount can be suppressed as much as possible. It is ゛.

EXAMPLE Hereinafter, a rotary compressor according to an example of the present invention will be described with reference to the drawings. Incidentally, in order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals and the explanation will be omitted.

FIGS. 1 and 2 show an embodiment of the rotary compressor of the present invention. In the figure, reference numeral 1o denotes a rear mount, which is welded and fixed to 6 of the rear lid shell 2C of the closed case 2 at a position that is the node and abdomen of the first-order natural vibration mode.

The operation of the rotary compressor configured as above will be described below.

When the electric compression element in the sealed case 2 compresses the refrigerant, torsional vibrations caused by load fluctuations etc. cause the sealed case 2 to vibrate. Since the piping is supported and fixed, the vibration transmitted to the piping is suppressed to a small level, and noise caused by vibration of the piping and pipe bending can be prevented.

Furthermore, as vibrations other than torsional vibrations that occur when compressing the refrigerant, vibrations that occur due to refrigerant pressure pulsations, mechanical collisions and sliding between parts, etc. occur, and these vibrations cause the rear lid shell 2C of the closed case 2 to It deforms and vibrates, and further vibrates the rear mount 10 welded and fixed to the rear lid shell 2C. At that time, as shown in Fig. 2, the rear lid shell 2C
has an antinode A near the center and the root, and deforms and vibrates in a first-order natural vibration mode with a node B between the antinode A in the center and the antinode A near the root and at the root, but the rear part The mount 10 is fixed by welding at two nodes B of the natural vibration mode and an antinode A between them. Therefore, vibration of the rear mount 1° caused by deformation vibration due to the first-order natural vibration mode of the rear lid shell 2C is prevented, and the rear mount 10 provides rigidity to the antinode of the first-order natural vibration mode of the rear lid shell 2C. By strengthening the rear lid shell 2C and the rear mount 1, vibration of the rear lid shell 2C is prevented.
It becomes possible to suppress the generation of noise caused by the vibration of the o.

Effects of the Invention As described above, the present invention provides a rotary compressor in which an electric compression element is directly fixed and housed in a sealed case, in which the electric compression element is fixed by welding to one or both of the ends of the sealed case and In a mount for supporting and fixing a die compressor, the mount is fixed at a position that is a node and an abdomen of a low-order natural vibration mode of the end of the hermetic case, so that the mount is fixed to the end of the hermetic case. By preventing vibration due to deformation vibration and suppressing deformation vibration of the end portion of the sealed case by the mount, noise generated by vibration of the end portion of the closed case and the mount is suppressed to a small level.

[Brief explanation of the drawing]

Fig. 1 is a front view of a rotary type compressor showing one embodiment of the present invention, Fig. 2 is an enlarged view showing an example of deformation vibration of the rear lid shell in Fig. 1, and Fig. 3 is a conventional rotary type compressor. It is a front view of a compressor. 2... Sealed case, 2c... Rear lid shell, 10... Rear mount. Name of agent: Patent attorney Toshio Nakao and one other person? −
--Urazen Goomata = ;2 figure

Claims (1)

[Claims] a sealed case in which an electric compression element is directly fixed and housed; a mount welded to one or both ends of the sealed case to support and fix the sealed case; A rotary compressor installed at the nodes and abdomen of the low-order natural vibration mode.